Forest plots displaying results from meta-analyses of the association between level of education and hysterectomy (random-effects model) comparing lowest versus highest education level for studies reporting: (a) hazard ratios (HR) and, (b) odds ratios (OR).

<p>Squares represent study-specific estimates (the size of the square reflects the study-specific statistical weight); horizontal lines represent 95% confidence intervals (CI); diamonds represent the summary estimate with corresponding 95% confidence interval. See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0151398#pone.0151398.t001" target="_blank">Table 1</a> for details of Study abbreviations.